/Engine/Source/Runtime/GeometryCore/Public/Operations/LocalPlanarSimplify.h
Test if a given edge collapse would cause a triangle flip or other unacceptable decrease in mesh quality Specialized for collapsing at flat triangles Test if a given edge collapse would cause a triangle flip or other unacceptable decrease in mesh quality
static bool CollapseWouldHurtTriangleQuality ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, const FVector3d & RemoveVNormal, int32 RemoveV, const FVector3d & RemoveVPos, int32 KeepV, const FVector3d & KeepVPos, double TryToImproveTriQualityThreshold, bool bHasMultipleNormals )